Предмет: Математика, автор: lyntik4pyntik

Помогите, пожалуйста...Срочно надо

1. На рисунке прямые а и b пересечены прямой с. Докажите, что a || Ь, если: с 2 а 43 а) t1 = 20°, 27 = 160°; 6) 22= 27; в) 21 = 30°, а угол 7 в пять раз больше угла 3. ь 85 76

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Ответы

Автор ответа: F9arl9SsSsSstfu

Ответ:

1)1+2=180°, 2=7 при паралельности, 180=160+20

2) 2=7 при парралельности

3)1и3- перекрестные, а 30×5=150;150+30=180

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